Detecting an ultrasonic beacon

An ultrasonic beacon and a ultrasonic receiver is very similar to a beam barrier circuit, the only difference is we don`t sound an alarm when an object breaks the ultrasonic path, but instead we try to locate the ultrasonic beacon by moving the receiver. This can be useful in robotics, when we use ultrasounds to detect a target (which in fact is t
Detecting an ultrasonic beacon - schematic

he beacon itself). For the emitter (the beacon itself), all we need is an oscillator set for a 35-45KHz frequency. We can achieve this using a 555 timer, a microcontroller and PWM, or discrete components. The simple the better, even though we lack some control over the signal shape: The range is excellent, at about 4 meters, the receiver was returning more than 100mV, for the detected signal, while at less than 1 meter it was putting out 4 V. The emission cone`s angle is almost 40 degrees wide. An excellent module for robotics! These modules can be hooked up to a microcontroller`s ADC port, and will return distance dependent voltages. So not only you can use them to spot the direction the sound is coming from, but you can also estimate the distance. The output is via the "signal" pin, which will provide approximately 0. 5V depending on the power level of the detected ultrasonic signal. i have an idea that if we craete a mp3 file which has pulses of 35 to 45khz and then connect the ultrasonic transducer directly to the phone and using head phone jack and play that mp3 file then the tx side ckt can be eliminated what say

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